var chap_array = new Array(
    ["29 - My Adolescent Sister Vol 8",'29'],

    ["28 - My Adolescent Sister Vol 7",'28'],

    ["27 - My Adolescent Sister Vol 6",'27'],

    ["26 - My Adolescent Sister - Business Trip",'26'],

    ["25 - My Adolescent Sister Vol 5",'25'],

    ["24 - My Adolescent Sister Vol 4",'24'],

    ["23 - My Adolescent Sister Vol 3",'23'],

    ["22 - My Adolescent Sister Vol 2",'22'],

    ["21 - My Adolescent Sister Vol 1",'21'],

    ["20 - My Adolescent Sister Vol 0",'20'],

    ["19 - Vol 19",'19'],

    ["18 - Vol 18",'18'],

    ["17 - Vol 17",'17'],

    ["16 - Vol 16",'16'],

    ["15 - Vol 15",'15'],

    ["14 - Vol 14",'14'],

    ["13 - Vol 13",'13'],

    ["12 - Vol 12",'12'],

    ["11 - Vol 11",'11'],

    ["10 - Vol 10",'10'],

    ["9 - Vol 9",'9'],

    ["8 - Vol 8",'8'],

    ["7 - Vol 7",'7'],

    ["6 - Vol 6",'6'],

    ["5 - Vol 5",'5'],

    ["4 - Vol 4",'4'],

    ["3 - Vol 3",'3'],

    ["2 - Vol 2",'2'],

    ["1 - Vol 1",'1']
);
for (var i=0; i<chap_array.length; i++) {
    document.getElementById('id_chapter_1').options[i] = new Option(chap_array[i][0],chap_array[i][1]);
    if (document.getElementById('id_chapter_2')) {
        document.getElementById('id_chapter_2').options[i] = new Option(chap_array[i][0],chap_array[i][1]);
    }
}